About Animals: Keeping Track of Time During Arctic Summers

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Animals Animals Animal Facts Habitat Facts Animal Pictures From Laura Klappenbach, your Guide to Animals Welcome to the Animals / Wildlife Newsletter, a weekly newsletter published by About.com's Animals / Wildlife website. For more about animals and wildlife, be sure to stop by the blog or browse the growing library of animal profiles. Keeping Track of Time During Arctic Summers Many animals rely on cues from their environment to set their daily and seasonal rhythms, also known as circadian rhythms. They time seasonal activities such as breeding, nesting, migration and... Read more Search Related Topics:  birds  circadian rhythms  arctic habitat Sea Cucumbers - The Ballistic Echinoderms Sea cucumbers are one of the five basic groups of echinoderms. There are about 1300 species of sea cucumbers alive today. Members of this group have a long body that... Read more Search Related Topics:  echinoderms  sea cucumbers  Starfish Starfish, also known as sea stars, are a group of echinoderms that include about 1500 living species. Starfish are often brightly colored animals. They can be red, orange, pink, blue,... Read more Search Related Topics:  starfish  echinoderms  Reptiles Reptiles are a group of vertebrates that includes crocodilians, lizards, snakes and turtles. There are about 8,000 species of reptiles alive today. Early reptiles diverged from other amniotes between 320 and 310 million years ago during the late Carboniferous Period. The articles listed below provide information about the characteristics, classification and evolution of reptiles. Related Searches Wildlife Animals Arctic Animals The Animals Animals Facts Animals Pictures Featured Articles Habitat Facts Zoology Basics Zoology Glossary Amphibians Fishes Birds   More from About.com Run Your First 5K Even couch potatoes can be ready for a 5K with just a couple months of training. Read more...> Help! I'm Too Busy Time and stress management tips to help you feel as though you have more time. Read more...> This newsletter is written by: Laura Klappenbach Animals Guide Email Me | My Blog | My Forum   Sign up for more free newsletters on your favorite topics You are receiving this newsletter because you subscribed to the About.com Animals newsletter. If you wish to change your email address or unsubscribe, please click here. About.com respects your privacy: Our Privacy Policy Contact Information: 1500 Broadway, 6th Floor New York, NY, 10036 © 2013 About.com   Must Reads Animals A to Z What is Evolution? Basic Animal Groups Facts About Animals Animal Characteristics   Follow me on: Advertisement